Ground-state phase diagram of the three-band d-p model

The phase diagram of cuprate high-temperature superconductors is investigated on the basis of the three-band model. We use the optimization variational Monte Carlo method, where improved many-body wave functions have been proposed to make the ground-state wave function more precise. We investigate t...

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Bibliographic Details
Published in:Europhysics letters 2021-04, Vol.134 (2), p.27004
Main Authors: Yanagisawa, Takashi, Miyazaki, Mitake, Yamaji, Kunihiko
Format: Article
Language:English
Subjects:
Antiferromagnetism
High temperature superconductors
Monte Carlo simulation
Parameters
Phase diagrams
Superconductivity
Wave functions
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Summary:The phase diagram of cuprate high-temperature superconductors is investigated on the basis of the three-band model. We use the optimization variational Monte Carlo method, where improved many-body wave functions have been proposed to make the ground-state wave function more precise. We investigate the stability of the antiferromagnetic state by changing the band parameters such as the hole number, level difference between d and p electrons and transfer integrals. We show that the antiferromagnetic correlation weakens when decreases and the pure d-wave superconducting phase may exist in this region. We present phase diagrams including antiferromagnetic and superconducting regions by varying the band parameters. The phase diagram obtained by changing the doping rate x contains antiferromagnetic, superconducting and also phase-separated phases. We propose that high-temperature superconductivity will occur near the antiferromagnetic boundary in the space of band parameters.
ISSN:0295-5075
1286-4854
DOI:10.1209/0295-5075/134/27004